Okay, so I've figured this out.
The account you are posting from has a barcelonacolours.com domain Jetpack connected site. However, much to my confusion, it is not the right one.
The correct barcelonacolours.com Jetpack site is connected via another WordPress.com user account.
Since I need both sites connected under the same WordPress.com site to transfer followers, you are going to need to do one of two things:
1. Disconnect Jetpack and reconnect with the account that you are posting from.
2. Log into WordPress.com with the other account and post a migration request confirmation on this thread.